Development and assessment of 316LVM cardiovascular stents

Raval, Ankur; Choubey, Animesh; Kothwala, Devesh

doi:10.1016/j.msea.2004.07.051

Cited by 22 publications

(13 citation statements)

References 14 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This would further support the notion that P and S on the electropolished surface originate from the electrolyte solution. The S contamination on the stainless steel surface from a sulfuric acid bath has been reported [21]. The increase in O after electropolishing is due to the formation of various metallic and non-metallic oxides (indicating the formation of a fresh passive layer).…”

Section: Resultsmentioning

confidence: 94%

“…Parameters that influence the electropolishing process include anodic current density, applied potential, bath temperature, reaction time, composition and concentration of electrolytes, and the anode-to-cathode surface area ratio [19]. Generally, electropolishing of stents has been preceded by various surface cleaning and physical treatments [20,21]. Furthermore, to prevent the oxidation and deterioration of stent products, surface passivation has been performed subsequent to the electrochemical process [21].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, electropolishing of stents has been preceded by various surface cleaning and physical treatments [20,21]. Furthermore, to prevent the oxidation and deterioration of stent products, surface passivation has been performed subsequent to the electrochemical process [21].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing

Nazneen

Galvin

Arrigan

et al. 2011

J Solid State Electrochem

View full text Add to dashboard Cite

The purpose of this work is to investigate the electropolishing of medical-grade 316 L stainless steel to obtain a clean, smooth, and defect-free surface in preparation for surface nano-texturing. Electropolishing of steel was conducted under stationary conditions in four electrolyte mixtures: (A) 4.5 M H 2 SO 4 + 11 M H 3 PO 4 , (B) 7.2 M H 2 SO 4 + 6.5 M H 3 PO 4 , (C) 6.4 M glycerol + 6.1 M H 3 PO 4 , and (D) 6.1 M H 3 PO 4 . The influence of electrolyte composition and concentration, temperature, and electropolishing time, in conjunction with linear sweep voltammetry and chronoamperometry, on the stainless steel surface was studied. The resulting surfaces of unpolished and optimally polished stainless steel were characterized in terms of contamination, defects, topography, roughness, hydrophilicity, and chemical composition by optical and atomic force microscopies, contact angle goniometry, and X-ray photoelectron spectroscopy. It was found that the optimally polished surfaces were obtained with the following parameters: electrolyte mixture A at 2.1 V of applied potential at 80°C for 10 min. This corresponded to the diffusion-limited dissolution of the surface. The root mean square surface roughness of the electropolished surface achieved was 0.4 nm over 2×2 μm 2 . Surface analysis showed that electropolishing led to ultraclean surfaces with reduced roughness and contamination thickness and with Cr, P, S, Mo, Ni, and O enrichment compared to untreated surfaces.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing

Nazneen

Galvin

Arrigan

et al. 2011

J Solid State Electrochem

View full text Add to dashboard Cite

show abstract

“…During LBμM, when a laser beam is focused on the surface of workpiece material, the material in the focal volume is subjected to different physical phenomena such as heating, softening/melting, vaporization, and explosive removal [5,6]. The physical phenomenon of LBμM is complicated because laser-material interaction depends on laser parameters (power density, wavelength, pulse duration, laser pulse repetition rate), material properties (thermal conductivity, thermal absorption coefficient), machining parameters (scanning speed, number of scans), and machining medium (gas, liquids) [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of underwater laser beam micromachining (UW-LBμM) on 304 stainless steel

Behera

Sankar

Swaminathan

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Fabrication of miniaturized components provides a challenge to the manufacturing industries and to meet the challenges many unconventional machining methods are developed, among which laser beam micromachining (LBμM) is one. But, thermal effects such as recast layer, heat-affected zone (HAZ), debris, and thermal cracks are commonly observed in LBμM. So, in order to minimize the thermal effects, underwater laser beam micromachining (UW-LBμM) came into existence. In this paper, experiment on UW-LBμM is reported using a Q-switched Nd:YAG laser for fabricating microchannels on 304 stainless steel. The effect of input process parameters (scanning speed, number of scan, laser pulse energy) on output responses (kerf width, kerf depth, surface roughness) of microchannel is studied. Laser micromachined channels are characterized by using optical microscopy, surface profilometer, scanning electron microscopy, and energy dispersive X-ray spectroscopy. It is observed that the dimensions of kerf width and kerf depth are low at lower number of scan, laser pulse energy, and higher scanning speed. The surface roughness decreases with decrease in number of scan and increase in laser pulse energy. Minimum surface roughness is achieved at scanning speed of 300 μm/s. The recast layer and debris are minimum during UW-LBμM compared to LBμM. Elemental comparison is carried out inside and in the surroundings of microchannel.

show abstract

“…Nd:YAG lasers have dominated stent manufacture where the mechanism of material removal is mostly thermal, based on melt ejection [2][3][4]. As a result, recasts and heat-affected zones (HAZs) are prominent, and post-processing procedures are required to remove these defects.…”

Section: Introductionmentioning

confidence: 99%

Underwater femtosecond laser micromachining of thin nitinol tubes for medical coronary stent manufacture

Muhammad

2012

Appl. Phys. A

View full text Add to dashboard Cite

Microprofiling of medical coronary stents has been dominated by the use of Nd:YAG lasers with pulse lengths in the range of a few milliseconds, and material removal is based on the melt ejection with a high-pressure gas. As a result, recast and heat-affected zones are produced, and various post-processing procedures are required to remove these defects. This paper reports a new approach of machining stents in submerged conditions using a 100-fs pulsed laser. A comparison is given of dry and underwater femtosecond laser micromachining techniques of nickeltitanium alloy (nitinol) typically used as the material for coronary stents. The characteristics of laser interactions with the material have been studied. A femtosecond Ti:sapphire laser system (wavelength of 800 nm, pulse duration of 100 fs, repetition rate of 1 kHz) was used to perform the cutting process. It is observed that machining under a thin water film resulted in no presence of heat-affected zone, debris, spatter or recast with fine-cut surface quality. At the optimum parameters, the results obtained with dry cutting showed nearly the same cut surface quality as with cutting under water. However, debris and recast formation still appeared on the dry cut, which is based on material vaporization. Physical processes involved during the cutting process in a thin water film, i.e. bubble formation and shock waves, are discussed. N. Muhammad · L. Li ( ) Laser

show abstract

Development and assessment of 316LVM cardiovascular stents

Cited by 22 publications

References 14 publications

Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing

Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing

Experimental investigation of underwater laser beam micromachining (UW-LBμM) on 304 stainless steel

Underwater femtosecond laser micromachining of thin nitinol tubes for medical coronary stent manufacture

Contact Info

Product

Resources

About